Shoe for piles



W. H. COBI SHOE FOR FILES Filed Oct INVENTOR iwlterii Gabi ATTORNEY June 10, 1947.

Patented June 10, 1947 SHOE FOR PILES Walter H. Gobi, New York, N. Y., assignor of onehalf to John J. Daugherty, St. Albans, N. Y.

Application October 3, 1945, Serial No. 620,105

6 Claims.

My invention relates to tips or shoes for foundation piles and especially for those having tubular shells which are driven and filled with concrete or cement.

The main object is to provide a shoe or tip capable of at the same time reenforcing the lower end of a tube and concentrating the soil at and adjacent thereto.

Another object is to provide a tip or shoe of maximum strength and a minimum weight.

Another object is to provide a shoe or tip which can be readily manufactured.

I have accordingly provided a shoe which can be of cast, pressed or forged metal and fitted to the lower end of a tube. This shoe preferably has a shoulder to take the thrust of the tube and a cutting edge substantially in line with the end of the tube and a central recess with walls of substantially uniform thickness extending upwardly from the cutting edge so that when the tube or pile is driven the earth beneath the shoe is compressed. A full hearing for the pile is thus provided.

Details of the improvement are illustrated and will be described.

Fig. 1 is a vertical cross sectional view of a tube or pile shoe embodying my invention.

Fig. 2 is a sectional view showing a shoe fitted to a pile tip and just started to be driven into the ground.

Fig. 3 is a similar View showing the end of the pile with the shoe driven further into the soil.

Figs. 4 and 5 are fragmentary vertical sectional views showing modifications.

Fig. 6 is a horizontal sectional view of one-half of a corrugated tube.

The shoe is preferably formed in one piece like an inverted cup and has a shoulder I to take the thrust of the tube 8. Beneath this shoulder I is a cutting edge 9. An inclined wall I0 serves to center the tube as the shoe is applied. An outer flange II is also preferably provided to reinforce the tube and add to the bearing area. Between the wall Ill and flange I I is a groove I2 into which the end of the tube is fitted. From the cutting edge 9, the walls I 3 of the shoe arch upwardly preferably on a parabolic curve to form a pocket or recess I4 so as to draw inwardly and compress the soil within this recess when the tube I or pile is driven.

This construction affords an easy start for the driving operation and a maximum support for the driven pile.

The shoe also reinforces and protects the lower end of the pile and prevents it from bending or splitting.

To add to the rigidity and to ensure closure at the end of the tube, the flange I I may be welded to the tube as indicated at 8'.

The tube may be seamless or welded and of any suitable cross-section, for instance, cylindrical as shown in Fig. 2 or corrugated as shown in Fig. 6.

or fluted. The shoe of course will be shaped to fit the tube. So also the lower end of the shoe may have a continuous cutting edge as shown in Figs. 1 to 3 or the edge may be serrated or toothed as shown at I 5 in Fig. 4.

The arched central portion of the tip not only assists in centering the tip on the tube but affords a maximum strength for a minimum weight of metal.

I claim:

1. A metal shoe for a pile tube comprising a central arched portion having a recess below and having an exterior annular shoulder formed above and around the rim for receiving the annular end of the tube and having a lower cutting edge surrounding said recess for drawing in and compressing soil within said recess.

2. A pile shoe comprising a rigid imperforate metallic body fitted to support a pile tube and having an arched central portion with a recess of parabolic section in its lower face, the lower wall of which terminates in a cutting edge.

3. A pile shoe comprising a rigid body having a peripheral flange with a seat around its upper face for supporting a pile tube and having an arched central portion with a recess in its lower face terminating in a cutting edge in approximate alinement with the tube seat, I

4. A metallic pile shoe having an arched central wall of substantially uniform thickness and with a recess therebelow, a cutting edge surrounding its lower edge, a, tube seat above said edge and a flange surrounding said seat.

5. A metallic pile shoe having a peripheral cutting edge surrounding a recess having inwardly and upwardly arched walls adapted to center a pile tube and concentrate the soil beneath it to- 3 ward the center as the pile tube is driven, said shoe having a shoulder on which the pile tube rests.

6. The combination of a tubular metallic pile and a metallic shoe mounted on the end thereof, said. shoe comprising central arched portion having a recess below and having an exterior annular shoulder formed above and around the rim of its recess for receiving the annular end of the tube and having a lower cutting edge surrounding said recess for drawing in and compressing soil within said recess, the end of the tube being welded to said shoe.

WALTERT'iH. C031.

4 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 850,389 McClintock Apr. 16, 1907 FOREIGN PATENTS 10 Number Country Date 344,369 Germany 1921 748,669 France 1933 50,956 Austria 1911 $15,788 Great Britain 1911 

